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Turn A Broken Phone Into A Home Server
(youtu.be)
Hosting your own services. Preferably at home and on low-power or shared hardware.
Also check out:
Using phone is dangerous as server because of battery
In the video he explains how he removed the battery and made a direct power connection.
“But then I’d have to watch the video!”
Can serve as emergency power though. Something you would have to add anyway with a serious setup.
But not good long term. A lithium ion battery being constantly drained and charged to 100% will keep the temperature high and wear it out more quickly and the more worn a lithium ion battery is, the more likely it will catch fire or explode.